Castor, Mountain summit between Valais, Switzerland and Aosta Valley, Italy.
Castor is a 4223-meter peak in the Pennine Alps along the Switzerland-Italy border, with steep granite walls and year-round glaciers. The terrain combines rock and ice climbing over exposed sections.
The first recorded ascent took place in 1861 when F.W. Jacomb and William Mathews summited with guide Michel Croz. This climb helped establish the mountain as a recognized route in the climbing community.
The peak takes its name from the Roman twins and forms a pair with nearby Pollux, representing the legendary Dioscuri of mythology. Visitors often discover this connection only when they see both summits standing together.
Climbers can begin from Klein Matterhorn on the Swiss side or approach via Capanna Quintino Sella hut from the Italian side. Snow, ice, and rock climbing gear are necessary, with stable weather being critical for safe passage.
The area features the Felikjoch pass at 4068 meters and the Zwillingsjoch pass at 3845 meters, two alpine crossings that enable a technical traverse. Experienced climbers value these high passes for their direct exposure and challenging nature.
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